Mode of action of beta receptor antagonists on cardiac muscle.
D000818:Animals; D001001:Anura; D004837:Epinephrine / Q000494:pharmacology*; D006321:Heart / Q000187:drug effects*; D011817:Rabbits; D013565:Sympatholytics / Q000494:pharmacology*
D013565:Sympatholytics; D004837:Epinephrine